下列数据中，最符合事实的是（ ）
A．一个苹果的质量约为2kg
B．比赛用篮球的直径约为80cm
C．中学生正常步行的速度约为10m/s
D．中学生登上一层楼做功约1500J
A、一个苹果大约0.1kg，故A不符合事实；
B、比赛用篮球的直径约为24.6cm，故B不符合事实；
C、中学生正常步行的速度约为1.5m/s，故C不符合事实；
D、中学生的质量大约是50kg，一层楼的高度大约是3m．
G=mg=50kg×10N/Kg=500N，
W=Gh=500N×3m=1500J．故D符合事实．
故选D．
For a few years, I have been wearing a ring on my right hand. It’s not always the ____ ring, but it’s always a ring that has ____ on it so that when I look at it, I’m ____ or reminded of something important. I have made a ____ of buying rings like this whenever I see one in a store. Sometimes I give them away as ____ to someone like Jennie. I first met Jennie in the ____ waiting room and we had talked several times. One night I sat down beside her and ____ how her son was doing because I knew that he was in very ____ condition. She told me that she didn’t know what to do more because it seemed none of the ____ from the doctors was good. They weren’t at all sure her son was going to ____ the accident that had hurt him so badly. With ____ in her eyes she said, “They’re ____ my hope.” I knew then that it was ____ just a coincidence(巧合)that I was wearing the ring that I had on that day. As she ____ to talk, I ____ slipped the ring off my finger and placed it in Jennie’s hand. I told her to wear it to remember that God loved her and He would be with her ____ all of this. ____ Jennie looked down at the ring, she got excited and then held it tightly, ____ the word written on the ring was “HOPE”. The last day I was at the hospital, I saw Jennie in the distance as I got on the lift. She ____ and held up the hand with the ring on it as she called out to me saying, “Look, I ____ have Hope!”
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